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Description of problem:

ceph_file_splice_write does not mark Fw cap dirty. File size update gets lost.


How reproducible:
1. use splice(2) to write data to a file from one cephfs mount
2. stat the file from another cephfs mount. stat will show file size does not change.

Patch(es) committed on kernel-3.10.0-1114.el7

compile following code; run the result program in /mnt/cephfs (./a.out testfile); umount /mnt/cech; mount /mnt/ceph again; check if 'testfile' size is correct.

include <errno.h>
#include <string.h>
#include <signal.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>

int main(int argc, char* argv[])
{
        int pipes[2];
        int fd;

        pipe(pipes);

        fd = open(argv[1], O_CREAT | O_RDWR, 0666);


        write(pipes[1], "hello", 5);

        splice(pipes[0], NULL, fd, NULL, 5, 0);

        return 0;
}

Verified the fix in kernel : 3.10.0-1127.el7.x86_64 

Moving to verified.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:1016